/*
 * Copyright (c) 2007 Team and Concepts Limited.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Team and Concepts Limited nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TEAM AND CONCEPTS LIMITED ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL TEAM AND CONCEPTS LIMITED BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;

namespace EditGrid.API.Client
{
    public class CellPosition : CellRef
    {
        private int row, col;

        public int Row
        {
            get { return this.row; }
        }

        public int Col
        {
            get { return this.col; }
        }

        public CellPosition(int row, int col)
        {
            this.row = row;
            this.col = col;
        }

        public CellPosition(string cellPosition)
        {
            Regex regex1 = new Regex("^[rR]([0-9]+)[cC]([0-9]+)$");
            Match match1 = regex1.Match(cellPosition);
            if (match1.Success)
            {
                this.row = int.Parse(match1.Groups[1].Value);
                this.col = int.Parse(match1.Groups[2].Value);
            }
            else
            {
                Regex regex2 = new Regex("^([a-zA-Z]+)([0-9]+)$");
                Match match2 = regex2.Match(cellPosition);
                if (match2.Success)
                {
                    this.row = int.Parse(match2.Groups[2].Value);
                    this.col = this.ColLabelToIndex(match2.Groups[1].Value);
                }
                else
                {
                    throw new FormatException("Invalid cell position: " + cellPosition);
                }
            }
        }

        override public string ToString()
        {
            return "R" + row + "C" + col;
        }

        public override bool Equals(object obj)
        {
            if (obj is CellPosition)
            {
                CellPosition obj2 = (CellPosition) obj;
                return (obj2.col == this.col && obj2.row == this.row);
            }
            else
            {
                return false;
            }
        }

        public override int GetHashCode()
        {
            return this.row;
        }

        private int ColLabelToIndex(string label)
        {
            int index = 0;
            int b = 1;
            char[] c = label.ToUpper().ToCharArray();
            for (int i = c.Length - 1; i >= 0; i--)
            {
                index += (c[i] - 'A' + 1) * b;
                b *= 26;
            }
            return index;
        }
    }
}
